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Class 0 Protostars in the Perseus Molecular Cloud: A Correlation Between the Youngest Protostars and the Dense Gas Distribution
Bernard, J. -P.; Hill, T.; White, G. J. +18 more
We use PACS and SPIRE continuum data at 160 µm, 250 µm, 350 µm, and 500 µm from the Herschel Gould Belt Survey to sample seven clumps in Perseus: B1, B1-E, B5, IC 348, L1448, L1455, and NGC 1333. Additionally, we identify and characterize the embedded Class 0 protostars using detections of compact Herschel sources at 70 &mi…
The VLT-FLAMES Tarantula Survey. XIV. The O-type stellar content of 30 Doradus
Lennon, D. J.; Simón-Díaz, S.; de Koter, A. +6 more
Detailed spectral classifications are presented for 352 O-B0 stars in the VLT-FLAMES Tarantula Survey ESO Large Programme, of which 213 O-type are judged of sufficiently high quality for further morphological analysis. Among them, six subcategories of special interest are distinguished. (1) Several new examples of the earliest spectral types O2-O3…
Dust in the diffuse interstellar medium. Extinction, emission, linear and circular polarisation
Siebenmorgen, R.; Bagnulo, S.; Voshchinnikov, N. V.
We present a model for the diffuse interstellar dust that explains the observed wavelength-dependence of extinction, emission, and the linear and circular polarisation of light. The model is set up with a small number of parameters. It consists of a mixture of amorphous carbon and silicate grains with sizes from the molecular domain of 0.5 up to a…
Secular- and merger-built bulges in barred galaxies
Corsini, E. M.; Aguerri, J. A. L.; Méndez-Abreu, J. +1 more
Context. Historically, galaxy bulges were thought to be single-component objects at the center of galaxies. However, this picture is now questioned since different bulge types with different formation paths, namely classical and pseudobulges, have been found coexisting within the same galaxy.
Aims: We study the incidence and nature of composi…
A new double radio relic in PSZ1 G096.89+24.17 and a radio relic mass-luminosity relation
Vazza, F.; van Weeren, R. J.; Bonafede, A. +3 more
Radio relics are diffuse synchrotron sources in galaxy clusters that are believed to trace large-scale shock waves. We have discovered a new double radio relic system in PSZ1 G096.89+24.17 (z = 0.3) and have carried out a full-polarization radio observation using the Westerbork Synthesis Radio Telescope at 1.4 GHz. The observation revealed the pre…
New distances to RAVE stars
Gilmore, G.; Watson, F.; Steinmetz, M. +16 more
Probability density functions (pdfs) are determined from new stellar parameters for the distance moduli of stars for which the RAdial Velocity Experiment (RAVE) has obtained spectra with S/N ≥ 10. Single-Gaussian fits to the pdf in distance modulus suffice for roughly half the stars, with most of the other half having satisfactory two-Gaussian rep…
Disk Radii and Grain Sizes in Herschel-resolved Debris Disks
Moór, Attila; Pawellek, Nicole; Ábrahám, Péter +5 more
The radii of debris disks and the sizes of their dust grains are important tracers of the planetesimal formation mechanisms and physical processes operating in these systems. Here we use a representative sample of 34 debris disks resolved in various Herschel Space Observatory (Herschel is an ESA space observatory with science instruments provided …
Planck 2013 results. XIV. Zodiacal emission
Kneissl, R.; Miville-Deschênes, M. -A.; Boulanger, F. +229 more
The Planck satellite provides a set of all-sky maps at nine frequencies from 30 GHz to 857 GHz. Planets, minor bodies, and diffuse interplanetary dust emission (IPD) are all observed. The IPD can be separated from Galactic and other emissions because Planck views a given point on the celestial sphere multiple times, through different columns of IP…
[C II] and 12CO(1-0) Emission Maps in HLSJ091828.6+514223: A Strongly Lensed Interacting System at z = 5.24
Smail, I.; Kneib, J. -P.; Altieri, B. +25 more
We present Submillimeter Array [C II] 158 µm and Karl G. Jansky Very Large Array 12CO(1-0) line emission maps for the bright, lensed, submillimeter source at z = 5.2430 behind A 773: HLSJ091828.6+514223 (HLS0918). We combine these measurements with previously reported line profiles, including multiple 12CO rotational tr…
An unbiased study of debris discs around A-type stars with Herschel
Duchêne, G.; Wyatt, M. C.; Phillips, N. +8 more
The Herschel DEBRIS (Disc Emission via a Bias-free Reconnaissance in the Infrared/Submillimetre) survey brings us a unique perspective on the study of debris discs around main-sequence A-type stars. Bias-free by design, the survey offers a remarkable data set with which to investigate the cold disc properties. The statistical analysis of the 100 a…